A new generation of so-called "advanced" nuclear power reactors that Washington believes could help fight climate change often present greater proliferation risks than conventional nuclear power, a science advocacy group said on Thursday.

President Joe Biden, a Democrat, has made curbing climate change one of the pillars of his administration and has supported research and development for advanced nuclear technologies.

The reactors are also popular with many Republicans. Last October, the month before Biden was elected, the US Department of Energy, awarded...